/*
 * Copyright 2009 Cedric Priscal
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android_serialport_api2;

import android.util.Log;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import cn.demomaster.quicklogger.QdLog;

public class SerialPort {

    private static final String TAG = "SerialPort";

    /*
     * Do not remove or rename the field mFd: it is used by native method close();
     */
    private FileDescriptor mFd;
    private FileInputStream mFileInputStream;
    private FileOutputStream mFileOutputStream;

    public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {
        //Log.i("test", "device:"+device.getAbsolutePath());
        /* Check access permission */
        if (!device.canRead() || !device.canWrite()) {
            try {
                String suPathName = "bin";
                File suFile = new File("/system/bin/su");
                File suFile2 = new File("/system/xbin/su");
                if (suFile.exists()) {
                    Log.i("test", "bin存在");
                } else if (suFile2.exists()) {
                    Log.i("test", "xbin存在");
                    suPathName = "xbin";
                } else {
                    suPathName = null;
                    Log.i("test", "bin不存在,xbin不存在");
                }

                if (suPathName != null) {
                    /* Missing read/write permission, trying to chmod the file */
                    Process su;
                    su = Runtime.getRuntime().exec("/system/" + suPathName + "/su");
                    String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
                            + "exit\n";
                    su.getOutputStream().write(cmd.getBytes());
                    if ((su.waitFor() != 0) || !device.canRead()
                            || !device.canWrite()) {
                        throw new SecurityException();
                    }
                }
            } catch (Exception e) {
                QdLog.e(e);
                throw new SecurityException();
            }
        }

        mFd = open(device.getAbsolutePath(), baudrate, flags);
        if (mFd == null) {
            Log.e(TAG, "native open returns null");
            throw new IOException();
        }
        mFileInputStream = new FileInputStream(mFd);
        mFileOutputStream = new FileOutputStream(mFd);
    }

    // Getters and setters
    public InputStream getInputStream() {
        return mFileInputStream;
    }

    public OutputStream getOutputStream() {
        return mFileOutputStream;
    }

    // JNI
    private native static FileDescriptor open(String path, int baudrate, int flags);

    public native void close();

    static {
        try {
            System.loadLibrary("serial_port");
        } catch (Exception e) {
            QdLog.e(e);
        }
    }
}
